Photoluminescence properties of ZnGa2O4:Mn phosphor powders

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We present the results of a systematic photoluminescence study of ZnGa2O4:Mn phosphor powder. This phosphor exhibits bright green luminescence with a spectral peak at 2.46 eV and CIE chromaticity coordinates of x equals 0.073 and y equals 0.696 at room temperature. At low temperatures the luminescence consisted of three components assigned to the 4T1-6A1 inner transition of the 3D electrons of Mn2+ ions located on different sites of the host crystal. Selective excitations were used to validate the assignment of these features based on a strong-field scheme. The photoluminescence lifetime showed a single exponential decay of about 4 ms and at T equals 1.6 K an optical phonon related fine structure [Ephonon equals (8.2 plus or minus 0.2) meV] of the main photoluminescence line was observed. These results indicate that Mn-doped ZnGa2O4 has the potential to serve as a green phosphor for field emission display (FED) devices. The CIE coordinates of the green emission measured for this phosphor powder are also sufficient to produce a wide color gamut and a true white color when combined with other red and blue phosphors in FED display devices.

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